diff --git a/src/lib/src/fwts_log_html.c b/src/lib/src/fwts_log_html.c
index c6d941a..009873f 100644
--- a/src/lib/src/fwts_log_html.c
+++ b/src/lib/src/fwts_log_html.c
@@ -222,7 +222,7 @@ static char *fwts_log_html_convert_ascii_str(const char *buffer)
 	/* Step 2, convert */
 	for (str1 = buffer; *str1; str1++) {
 		char *str = fwts_log_html_convert_ascii(*str1);
-		strcat(converted, str);
+		strncat(converted, str, len + 1);
 	}
 
 	return converted;